For each planet, we observe that the contrast between rough and smooth terrain can be significant at large scale (the MDS varies by more than one order of magnitude between the Lunar highlands and mare at a baseline of 100 km) while it is always much more subtle or even insignificant at short baseline. This had already been noted for the Moon by Rosenburg et al. (2011) and is related to the fact that, for all planets, the smooth terrains show steep negative slopes in the MDS/baseline plots, meaning that they appear much rougher at small spatial scales than at large ones.